here you go searing   --   mineral oil cooled mining rig

https://www.youtube.com/watch?v=EpNERMxvPTk&feature=player_embedded

this actually might be feasible

-- run main supply & return tubing to an automotive radiator
-- put a larger circulator pump in the main loop to keep the oil moving
-- use a smaller pump for each cooling tank that taps into the main supply & return
-- set the PSU's above the tank on a rack
-- move the radiator outdoor in summer & indoor in winter

other videos show the psu in the mineral oil too, but that'd take a lot more work and  larger tanks.

I wonder how many cubes one radiator could handle?